Umexa 3: Golden-Hearted Requiem.. Umexa, #3

Julissa Redfield, the seemingly composed Student Council President, has shed her mask of bureaucratic efficiency. Consumed by a "vicious adoration" for the necromancer Zulazar and a thirst for vengeance against the Infinity Ascendants, she has orchestrated a clandestine alliance that will flip the board on the Academy's elite. But as Zulazar and his loyal followers (the lethal Sara, the tactical Cyan, and the perpetually overwhelmed Lime) navigate the final rounds of the War Games, the "circus" officially comes to town.
A massive psionic assault by the rogue psychic Ninseers has turned the Grand Arena into a nightmare of "jester zombies", transforming tens of thousands of spectators into mindless, smiling puppets.  While Zulazar tears through the psychic static to dismantle the "ringmaster", a greater threat looms on the horizon. The Auguststein, a sentient, segmented fortress piloted by the disembodied head of the war-obsessed Blanbert, is on the move.